@robertjay
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Good morning Barry. I swapped out the R11 on both builds and all of the transistors are happily biased at 5.6v. When tracing the circuit I did notice R11 was 39k, higher than the other legs going to ground through a 1k8. Did we find a mistake? I used 3k9 thinking that was the intended value? IDK, but much better range for the voltage.
The gain still goes from 0 to crazy at 8 oclock… But I don’t care about that for my build. Who plays a High gain Mesa Dual Rec with the gain down anyway? hahaha.
Again while biasing, I see the gain control affects the voltage, so I figured to obviously bias the transistors at max gain and trim the resistance to 5.6
Let me know if that is wrong. I’m new to biasing voltages in my builds. And hey, thanks! good products. Good support. I always enjoy opening my pcb orders and seeing a smiley face on a free foot switch board or a buff n blend. I always include some swag in my build shipments.
Also… My Q1-4 biasing is a little off. # and 4 goes up past 6.5 when the gain pot is down. Is the biasing based on the gain pot? I didn’t read anything about setting the gain pot before biasing the trim pot settings….
Hi Billy. I’m back at this project. I did remove the B1M at the board, Just to be safe as far as the pot goes. It’s a 90 degree pcb mount pot that I don’t want to heat more than I have to. It seems fine. Range and change is as expected. I was pretty sure that i checked and rechecked all of the resistors around that gain pot circuit, but here is a pic as requested.
Hey, I just had a tranny or 2 that wouldn’t come down past 8!!!. I had a bad B1M pot. Once the gain pot was replaced, all was good with the biasing.
And now in the proper order from send to octave to dist to chorus. We are good. I only have the noise when the effect is on, and the drive / gain is maxed all the way clockwise. The slightest tiniest teeniest amount lowered and it goes away. So for me? I am happy. It’s my pedal. My prototype. I am also using a Modified DS-1 circuit with maxed gain and extra diodes for a fuzz gain. I am happy for now. Thank you.
The mystery continues. But in a good way. It works. I cut all wires to and fro in the middle, spliced and twisted for the multiple combinations of effects. So far, and I’m not so concerned with dirt before modulation and after the octave at this point. Trial and error and keeping this feed updated as they happen. In to buff n blend, send to chorus, out to octave, out to dist, out to return and to out. Works perfect.
OK, I removed 1 of the 3 in every arrangement. Everything is fine using 2 effects. All 3 is what gives me a problem. Why? Well, regardless. I thought that’s the whole point of adding the buff n blend? I had the noise before ordering this “solution”. Do I need a 4th in the circuit to even out the noise in the 3? Does it work that way? haha
Hi, I will be reverse engineering this pedal and seeing what may or may not be the cause. So, it could just be the fact that there are an odd number of affects? or that 1 may be the culprit? Either way, we shall see.
Hi, sorry. I couldn’t go back and edit after posting. When the pedal is off I have clean bypass. When effect is on, I have a metallic flanger sound. And I notice that the blend knob now seems to work backwards after I rewired the configuration. Confusing. Now instead of the dry signal being added by turning the knob clockwise, it ads the effect. The signal chain in, from guitar to the input of the pedal. To the buff n blend in, out the send, to the Octave circuit, to distortion to chorus, to buff n blend return, and out to the output jack. Right? Everything gets wired to and through the buff n blend, right?
